Analysis
- max time kernel
149s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
- submitted
21/07/2026, 12:18
General
- Target Tax-Number635863.exe
- Size 24KB
- Sample260721-pgmlhshc49
- SHA256 a5fad3d78a6c7592176718cb852aa46839dc72d131400f00e534dcb2b1d525ee
Malware Config
Extracted
-
valleyrat_s2
-
1.0
-
yk.ggdy.com:8003
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yk.ggdy.com:80
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103.59.103.30:8888
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103.59.103.30:6666
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127.0.0.1:80
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campaign_date
2023. 6.30
Signatures
- Family: ValleyRat
ValleyRat stage2 is a backdoor written in C++.
- Detects ValleyRAT payload 11 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates connected drives 3 TTPs 44 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Suspicious use of SetThreadContext 2 IoCs
- Executes dropped EXE 2 IoCs
- Loads dropped DLL 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: LoadsDriver 2 IoCs
- Suspicious use of SetWindowsHookEx 2 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Tax-Number635863.exe"C:\Users\Admin\AppData\Local\Temp\Tax-Number635863.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"2⤵
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
-
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C:\Windows\Temp\DCRCVDrv.sysC:\Windows\Temp\DCRCVDrv.sys1⤵
- Executes dropped EXE
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C:\Windows\system32\cmd.exe"cmd /c start "" /D "C:\ProgramData\USB3YTGH5" Tax-Number635863.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\ProgramData\USB3YTGH5\Tax-Number635863.exe"C:\ProgramData\USB3YTGH5\Tax-Number635863.exe"2⤵
- Suspicious use of SetThreadContext
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"3⤵
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
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Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Tax-Number635863.exe
msvcp140.dll
ucrtbase.dll
vcruntime140.dll
vcruntime140_1.dll
20260721132302.jpg
DCRCVDrv.sys
memory/688-31-0x0000000004000000-0x0000000004033000-memory.dmp
memory/688-39-0x0000000004180000-0x00000000041B9000-memory.dmp
memory/688-18-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-25-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-26-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-19-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-17-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-16-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-30-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-33-0x0000000004180000-0x00000000041B9000-memory.dmp
memory/688-32-0x0000000004180000-0x00000000041B9000-memory.dmp
memory/688-15-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-54-0x0000000004180000-0x00000000041B9000-memory.dmp
memory/688-44-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-43-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-21-0x0000000000400000-0x0000000000450000-memory.dmp
memory/688-41-0x0000000004180000-0x00000000041B9000-memory.dmp
memory/688-42-0x0000000004180000-0x00000000041B9000-memory.dmp
memory/2044-2-0x0000000000010000-0x000000000003D000-memory.dmp
memory/3800-49-0x0000000003560000-0x0000000003599000-memory.dmp
memory/3800-45-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-46-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-47-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-48-0x0000000003560000-0x0000000003599000-memory.dmp
memory/3800-37-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-50-0x0000000003560000-0x0000000003599000-memory.dmp
memory/3800-51-0x0000000003560000-0x0000000003599000-memory.dmp
memory/3800-52-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-53-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-35-0x0000000000400000-0x0000000000450000-memory.dmp
memory/3800-36-0x0000000000400000-0x0000000000450000-memory.dmp